Effect of the Rate, Temperature, and Magnitude of Prestraining on the Parameters of Phase Transformations and the Thermomechanical Characteristics of the 45% Ti–45% Ni–10% Nb Shape Memory Alloy in Press-Formed Conditions

Resumo

This work investigates the effect of the rate, temperature, and magnitude of the strain induced preliminarily to heating for developing shape memory effect on the phase composition, martensite transformation, phase transition temperature, lattice parameters, substructure parameters, and thermomechanic characteristics of the shape memory (SM) 45Ti–45Ni–10Nb (at %) alloy in the press-formed state. The relation between structural and thermomechanical parameters of the alloy is identified. The conditions of prestraining the SM alloy for achieving the best thermomechanic characteristics are determined. The results of this study have been used to develop a fire-protection device for nuclear power facilities.